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Nanoparticle‐Mediated Delivery of Micheliolide Analogs to Eliminate Leukemic Stem Cells in the Bone Marrow

Nanoparticle‐Mediated Delivery of Micheliolide Analogs to Eliminate Leukemic Stem Cells in the... Micheliolide (MCL) is a naturally occurring sesquiterpene lactone that selectively targets leukemic stem cells (LSCs), which persist after conventional chemotherapy for myeloid leukemias, leading to disease relapse. To overcome modest MCL cytotoxicity, analogs with ≈two–threefold greater cytotoxicity against LSCs are synthesized via late‐stage chemoenzymatic C─H functionalization. To enhance bone marrow delivery, MCL analogs are entrapped within bone‐targeted polymeric nanoparticles (NPs). Robust drug loading capacities of up to 20% (mg drug mg−1 NP) are obtained, with release dominated by analog hydrophobicity. NPs loaded with a hydrolytically stable analog are tested in a leukemic mouse model. Median survival improved by 13% and bone marrow LSCs are decreased 34‐fold following NPMCL treatments versus controls. Additionally, selective leukemic cell and LSC cytotoxicity of the treatment versus normal hematopoietic cells is observed. Overall, these studies demonstrate that MCL‐based antileukemic agents combined with bone‐targeted NPs offer a promising strategy for eradicating LSCs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Therapeutics Wiley

Nanoparticle‐Mediated Delivery of Micheliolide Analogs to Eliminate Leukemic Stem Cells in the Bone Marrow

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References (43)

Publisher
Wiley
Copyright
© 2022 Wiley‐VCH GmbH
eISSN
2366-3987
DOI
10.1002/adtp.202100100
Publisher site
See Article on Publisher Site

Abstract

Micheliolide (MCL) is a naturally occurring sesquiterpene lactone that selectively targets leukemic stem cells (LSCs), which persist after conventional chemotherapy for myeloid leukemias, leading to disease relapse. To overcome modest MCL cytotoxicity, analogs with ≈two–threefold greater cytotoxicity against LSCs are synthesized via late‐stage chemoenzymatic C─H functionalization. To enhance bone marrow delivery, MCL analogs are entrapped within bone‐targeted polymeric nanoparticles (NPs). Robust drug loading capacities of up to 20% (mg drug mg−1 NP) are obtained, with release dominated by analog hydrophobicity. NPs loaded with a hydrolytically stable analog are tested in a leukemic mouse model. Median survival improved by 13% and bone marrow LSCs are decreased 34‐fold following NPMCL treatments versus controls. Additionally, selective leukemic cell and LSC cytotoxicity of the treatment versus normal hematopoietic cells is observed. Overall, these studies demonstrate that MCL‐based antileukemic agents combined with bone‐targeted NPs offer a promising strategy for eradicating LSCs.

Journal

Advanced TherapeuticsWiley

Published: Jan 1, 2022

Keywords: drug delivery; leukemia; micheliolide; small molecule drugs; targeted delivery; late‐stage C‐H functionalization

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